This module covers foundational concepts of organic chemistry that are important for understanding pharmacokinetics and pharmacodynamics of drug molecules. The four main themes of the module are (1) organic chemistry in relation to biological action, (2) the class of organic compounds commonly used as drugs, (3) the structure-activity relationship in different drug classes, and (4) theory and practical skills for synthesis, characterisation, identification, and analysis of drugs. The scope of this module includes the principles of organic chemistry with emphasis on structure-activity relationships, computational chemistry and combinatorial chemistry. Laboratory procedures for drug synthesis, purification, characterisation as well as interpretation of Infrared and Nuclear Magnetic Resonance spectral data will also be covered in this module.